The top 10 stocks in the S&P 500 now make up 40% of the entire index.
For perspective:
• 1980s-1990s: hovered around 18-20%
• 2000 dot-com peak: 24%
• 2020: 25%
• Today: 40%
This is the most concentrated the market has been in decades. A handful of mega-cap tech names are driving everything.
What does this mean?
If you own an S&P 500 index fund, you're not as diversified as you think. You're making a massive bet on a few companies.
If those names stumble, the whole index stumbles. If they keep running, great — but concentration cuts both ways.
This isn't necessarily bad, but it's worth knowing what you actually own. "Passive" doesn't mean risk-free. It just means you're accepting whatever the market gives you — and right now, the market is giving you a very top-heavy portfolio.
Don't be surprised if volatility picks up when concentration is this extreme.
For perspective:
• 1980s-1990s: hovered around 18-20%
• 2000 dot-com peak: 24%
• 2020: 25%
• Today: 40%
This is the most concentrated the market has been in decades. A handful of mega-cap tech names are driving everything.
What does this mean?
If you own an S&P 500 index fund, you're not as diversified as you think. You're making a massive bet on a few companies.
If those names stumble, the whole index stumbles. If they keep running, great — but concentration cuts both ways.
This isn't necessarily bad, but it's worth knowing what you actually own. "Passive" doesn't mean risk-free. It just means you're accepting whatever the market gives you — and right now, the market is giving you a very top-heavy portfolio.
Don't be surprised if volatility picks up when concentration is this extreme.